Safety device for pressing-machines



A. 1. DREHER.

SAFETY DEVICE FOR PRESSING MACHINES.

APPLICATION HILED AUG-30. I919.

1,392,051 Patentdsept. 27, 1921.

2 SHEETS-SHEET l.

A. 1. DREHER.

SAFETY DEVICE FOR PRESSING MACHINES. APPLICATION FILEDIAUGJO, 1919.

1,392,051. PatentedSept. 27,1921.

2 SHEETS-SHEET 2.

l I I [NVENTOR STATES PATENT OFFEGE.

ALBERT J. DREHEB, OF NORWOOD, OHIO, ASSIGNOR TO THE AMERICAN LAUNDRY MACHINERY COMPANY, OF NORWOOD, OHIO, A CORPORATION OF OHIO.

SAFETY DEVICE FOR PRESSING-MACHINES.

Specification of Letters Patent.

Patented Sept. 2'2, 1921.

Application filed August 30, 1919. Serial No. 320,921.

and useful Improvements in Safety Devices for Pressing-Machines, of which the following is a specification.

This invention relates to safety devices for pressing machines, and more particularly machines for pressing cuffs and neckbands of shirts or other portions of wearing apparel. The invention is an improvement upon the machine described and claimed in an application for pressing machine filed of even date herewith jointly by myself and Charles E. WVaream.

In the machine of said joint application the movement of the relatively movable pressing members is produced partly by actuation by the operator of a treadle or other operating member and partly by fluid pres sure eans controlled by the operation of said treadle or member. The work is supported upon a work holder having lateral movement relative to the cooperating head thereby enabling it to be pulled out and exposed to view so that the work may be readily applied and taken off. I

The object of the present invention is to prevent relative movement of the pressing members when the work holder is out of registering relation with its cooperatin head or, in other words, to put it beyond the power of the operator to produce relative movement of the pressing members at any other time than when the work holder and cooperating head are 'in proper registering relation with each other.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

In the drawings, which represent one embodiment of the invention, Figure 1 is a side elevation illustrating the press open, part of the frame being broken out to expose interior mechanism; Fig. 2 is a rear elevation; Fig. 3 is a detail sectional elevation on the line 3 3, Fig. 1; Fig. 4 is a sectional plan view on the line 4-l. Fig. 5; Fig. 5 is a dctail'sectional elevation on the line 5--5, Fig. 2. looking in the direction of the arrows: Fig. 6 is a rear view of the bed and work support; Fig. 7 is a sectional elevation on a larger scale, through the work support,

on the line 7-7, Fig. 6; Fig. 8 is a detail section of a controlling tappet; and Fig. 9 is a horizontal section on the line 9-9, Fig. 5.

The machine shown in the drawings is for the most part of identically the same construction and arrangement as the one illustrated, described and claimed in the joint application before referred to, to which application reference may bemade for a more complete description of said machine. Briefly described, for the purposes of this application, said machine comprises a frame 1 provided with a hollow heated stationary pressing head 2 and a vertically movable bed 3 beneath the same. On the bed is a padded work holding support 4 supported by a rod 5 slidable in an opening in the bed, said rod having an-operating handle 6 enabling the operator to pull the work support out to the position shown in Fig. 1 for applying the work thereto or removing it therefrom, as thecase may be.

The bed 3 is supported by a hollow cylinder 7 having a bottom closing cap 8, said cylinder and cap having vertical sliding movement on the stationary piston 9 supported by a hollow piston rod 10 and base 11. A channel or passage 12 throu h the piston 'rod and base communicates with a channel 13 inthe hollow extension of a valve case 14 provided with four valve chambers as follows: chamber 15 communicating with a steam supply pipe 16; chamber 17 in which is a valve 18; chamber 19 communicating with the passage 13 and in which chamber is a valve 20; and chamber 21 communicating with the exhaust pipe 22. Valve 18 controls the flow of pressure from chamber 17 to chamber 19. Valve 20 controls the flow from chamber 19 to chamber 21. The stems of the Valves are connected as shown in Fig. 3 to the arms of a lever 23 whose outer end is connected to a sleeve 24 slidable on a rod 25 between two compression springs 26, the pressure of which may be regulated by the adjust-able nuts 27. The lower end of rod 25 is connected to one arm of a lever 28 whose opposite arm is connected by a link 29 to the pressure treadle 30 pivoted at 31 to the stationary frame. 82 indicates an adjustable needle valve controlling the flow of ressure from chamber 15 to chamber 17. ressure treadle 30 has an arm portion 33 forming one element of a toggle, said arm being p)ivotally connected to the other toggle mem or 34, whose yoke end portion straddles a pin 35 carried by a yoke36 connected to two rods 37 which pass through the frame and are connected at their upper ends by knuckles 38 to rods 39 rigid with the bed 3. 40 indicates a release treadle pivoted at 41 and having an arm 42 lying under the pressure treadle. RSO far as described to this point, the machine is identical with that of the joint application referred to, its operation being as follows:

Depression of the treadle 3O closes the toggle 33, '34 and partially elevates the bed and work support toward the head. The same movement pulls down the link 29 and finally turns the lever 23 thereby opening the valve 18 and closing valve 20, so that pressure flows to the cylinder 7 and produces heavy pressure on the work. Depression of the release treadle breaks the toggle and finally shifts lever 23 so as to open valve 20 and close valve 18, thereby releasing pressure from the cylinder and allowing the bed to move toits lower position.

According to the present invention suitable means is provided for establishing a relation between the worksupport and the operating mechanism which controls the flow of power to the power cylinder. ,As shown, a suitable portion of the fixed frame, such as the head 2, is provided with a bracket 43 on which is suspended an oscillating arm 44 having a weight 45, if desired. This arm has an extension 46 toward the bed 3, the parts being so proportioned that the weight 45 always tends to move the extension 46 toward said bed.- In open position of the press, as shown in Fig. 1, when the w0rk support is pulled out to exposed position, said extension abuts a fixed stop 47 projecting out from the rear face of the bed. 'In this position a finger 48 of the arm 44 lies directly above a small tappet 49 adjustably mounted on the upper end of the rod 25. For example, said tappet may be a hollow threaded cylinder, as shown in Fig. 8, held in adjusted position on the rod 25 by the lock nut 50. In this position of the parts it is impossible to close the press for the reason that the first downward motion of treadle 30 tends to elevate the rod 25, but the finger 48 lies in the path of movement of said rod and prevents its upward 'movement. The press is therefore locked against relative movement of the pressing members.

The work support 4 is so arranged asv to unlock the press when the work support is moved into registering relation with the head. Any suitable arrangement ma be used for this purpose. The drawings lllllS- trate a part of the work su ort arranged to contact the extension 46.

ore particularly,

the work support has secured thereto a small work suppxort is out of cooperating relation with the ead.

What I claim is i 1. A pressing machine, comprising a pressing member and a work supporting member having relative movement from and toward each other for the pressing operation, one of saidmembers being also laterally movable into and out of registering relation with the other member, operator operated means for producing relative movement of the pressing members toward and from each other, power means for producing preventing operation of said power means except when the members are in registering relation with each other.

2. A pressing machine, comprising a pressing member and a work supporting member havin relative movement from and toward each 0t er for the pressing operation, one of said members bein also laterally movable into and out of registering relation heavy pressure on the work, and means for with the other member, operator operated means for producing relative movement of the pressing members toward and from each other, power means for producing heavy pressure on the work, and means controlled by the relative lateral movement of said members for preventing operation of said power means except when said members are in' registering relation with each other.

3. A pressing machine, comprising a presssing member and awork supportin member having relative movement tower and from each other for the pressing operation, operator operated means for producing such movement,'said members also having relative lateral movement into and out of registering relation with each other, power means for producing heavy pressureon the work, and controlling means therefor affected by, the relative lateral position of said members for preventing operation of said power means exce t when said members are in registering rela ion.

4. A pressmg machine, comprising a stationary head member, a work supporting member beneath the same,'treadle actuated means for producing relative movement of said members toward and from eachother, power meansfor also producing such movement, said work supporting member having horizontal movement relative'to said head member, and means operative when the work supporting member is out of registering relation with said head member for preventing actuation of said power means.

5. A pressing machine, comprising a pressingamember, a work support movable toward an from the same for the pressing operation and also movable laterally relative thereto into and out of registering relation therewith, a treadle for advancing said work support toward said pressing member, power means controlled thereby for producing heavy pressure between saidwork sup port and pressing member, and'me'ans controlled by the relative lateral positions of said pressing member. and work support for preventing actuation of saidtreadle except when said work support and pressing member are in registering relation.

6. A pressing machine, comprising a pressing member, a work support movable toward and from the same for the pressing operation and also movable laterally relative thereto into and out ofregistering relation therewith, a treadle for advancing said work support toward said pressing member,

fluid pressure means for. producing relative pressing movement between said work support and pressing member, and controlling means therefor affected by the lateral position of-the work support for preventing application of fluid pressure except-when the work support and pressing member are in registering relation.

7. A pressing machine, comprising a pressing member, a work support movable toward and from the same for the pressing operation and also movable laterally rela-- tive thereto into and out of registering relation therewith, a treadle for advancing said work support toward said pressing member, fluid pressure means for producing pressing. movement between said work support and pressing member, valve means for controlling the flowof fluid pressure thereto, and

'means whereby the movement of said .work

support to a position out of registering re-' lation with said pressing member prevents actuation of said valve means.

In testimony whereof I afiix m signature.

ALBERT J. Di;

EHER. 

